A measurement of the complete differential cross section for the reaction ppdn' at 3.00, 3.20, 3.43, 3.65, 3.83, 4.00, 4.20, and 5.05 GeV/c incident proton momentum has been made in an attempt to establish the role of the A(1950) in this region. The data show that the previously observed enhancement in the forward cross section between 3 and 4 G e~/ c due to this isobar is an effect which damps out quickly a s the production angle departs from zero degrees, in contrast with the well-known enhancement at 1 . 3 5 GeV/c, which i s evident a t all angles. In particular, the one-pion-exchange model is in poor agreement with the extended set of data. A detailed description is given of a novel proportional-wire-chamber system which facilitated the selection of this rather r a r e reaction from a very high competing background.

Differential cross sections for a$ elastic scattering from 60" to 175" center of momentum ( c n . ) were measured at 3.43, 4.50, 5.75, and 6.60 GeV/c incident deuteron momentum. The measurements were made with a two-arm magnetic spectrometer, making use of multiwire proportional chamber detectors. The deuterons were accelerated at the Bevatron of the Lawrence Berkeley Laboratory. Data are compared with predictions of the baryon-pickup model and the one-pion-exchange model. The backward dip at 180" c.m. for 4.5 GeV/c, predicted by Craigie and Wilkin using the one-pion-exchange model, is'not observed, but reasonable fits to the momentum variation and angular distributions are found. When the data are plotted against the variable A of the baryon-pickup model, the s dependence is greatly reduced.

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